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Add decorator registration support with compile-time validation (#303)

* Add decorator pattern support to source generator

Adds RegisterDecoratorAttribute (non-generic and generic variants) for
wrapping existing service registrations with decorator classes. The
generator emits a self-contained runtime helper (Injectio.Decoration.g.cs)
so no new package dependencies are introduced.

- Supports chaining via Order (lower = innermost)
- Supports keyed decoration, AnyKey, open-generic (closed instances),
  factory-built decorators, and tag filtering
- Adds diagnostics INJ0010-INJ0016 for decorator validation
- Runtime helpers use ActivatorUtilities for DI-friendly construction

https://claude.ai/code/session_01DFMTsCCwsWoYM7vWumE6mw

* Refactor generators: models, pipeline & infra

* progress

* bug fixes

* Update Extensions.cs

* Delete Injectio.Attributes.csproj

* Delete REFACTOR_PLAN.md

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Co-authored-by: Claude <noreply@anthropic.com>

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